The Perm-Lok permanently engages the Central Axle Disconnect (CAD) system and couples both front axles. Once installed, the front axles will not pull until the transfer case is engaged.
4x4 Posi-Lok replaces the thermal linear actuator with a cable operated actuator that puts the driver in control of the engagement from inside the cab. After engaging the transfer case, a one inch pull of the 4x4 Posi-Lok cable slides the shift fork and collar to connect the right front axle to the intermediate shaft and 4-wheel drive is engaged! Simply reverse the procedure to disengage 4-wheel drive. 4x4 Posi-Lok also works great with lockers! When the front axle is locked, you can disengage the passenger side in order to make turns without wheel hop.
  • Ideal for Fleet Operators amd Emergency Vehicles

Application Summary:

Year Make/Model
1988-1998 - 1500, 2500 Pickup 6 Lug, 1992-1998
Suburban, Tahoe, Yukon 6 Lug, 1988-1998
2500, 3500 Pickup 8 Lug, 1992-1998
Suburban 8Lug, * Note: With Thermal Linear Actuator (TLA)
California Proposition 65 Yes
Country of Origin (Primary) US
Harmonized Tariff Code (Schedule B) 8708706045
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N

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4X4 Posi-Lok PSL1000 Permanent 4WD Engagement System

Product Information

Vehicle Fitment